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If a circle has a radius of 4 cm, what is the diameter of the circle?

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Question: If a circle has a radius of 4 cm, what is the diameter of the circle?

Options:

  1. 8 cm
  2. 12 cm
  3. 16 cm
  4. 10 cm

Correct Answer: 8 cm

Solution: 

The diameter of a circle is twice the radius. For a radius of 4 cm, the diameter is 2 * 4 = 8 cm.

If a circle has a radius of 4 cm, what is the diameter of the circle?

Practice Questions

Q1
If a circle has a radius of 4 cm, what is the diameter of the circle?
  1. 8 cm
  2. 12 cm
  3. 16 cm
  4. 10 cm

Questions & Step-by-Step Solutions

If a circle has a radius of 4 cm, what is the diameter of the circle?
  • Step 1: Understand that the radius is the distance from the center of the circle to the edge.
  • Step 2: Know that the diameter is the distance across the circle, passing through the center.
  • Step 3: Remember that the diameter is always twice the length of the radius.
  • Step 4: Since the radius is given as 4 cm, multiply it by 2 to find the diameter.
  • Step 5: Calculate 2 * 4 cm, which equals 8 cm.
  • Circle Properties – Understanding the relationship between the radius and diameter of a circle.
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